Lazysheepherd

I have a strong feeling it's Windows-related, that is, if your system uses Windows. The following is for Win 7: https://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/windows-7-wont-sleep-or-hibernate/208de011-3792-4e12-8368-6c67381186e2

Here's one for Windows 8.1 (with additional links, including one at the bottom titled "Hibernate Your PC", and mentions there are some computers put together without a hibernate option, such as certain laptops or tablets, or PCs with something called InstantGo that I'm not familiar with): http://windows.microsoft.com/en-us/windows-8/how-shut-down-turn-off-pc

Heyy, thank you Jen! I just solved it today. Just done a little extended search and found that constant Ethernet connection could wake pc up. And I guess that was the case for me.

So from Device Manager, I get to Network Adapter options and took away it's permission to wake the pc... when it's feel like. =)

Currently, everything back to normal. Yesh, now I see same topic with yours.

And dear 5746, seems that^ would be a 'why'. =)